Among the PDA modems, the convenience of the PC Card format won us over, and the extras that come with the Sierra Wireless AirCard 550/555 earned it our editorial kudos. It runs on the CDMA2000 1X network, where we were able to receive it, and the built-in headset jack lets the unit act as an extra cell phone in case of an emergency (you wouldn't rely on it though, since the battery life isn't so hot, and there's no way to store names and numbers). SMS via Verizon Wireless was a nice perk, too.

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